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BMD (Bone Mineral Densitometry)

Norland XR-600 Bone Mineral Densitometer

Gold Coast Radiology Scanner:

The Norland XR-600 Bone Mineral Densitometer is a well renowned world leader in the provision of Bone Density scanners.  Standard scan sites include AP (antero posterior) Spine, Prximal Femur, Lateral Spine and Forearm.  A number of patented technologies make the Norland XR-600 Bone Mineral Densitometer an invaluable tool in the diagnosis of osteoporosis including maximum reading accuracy and precision which ensures discrimination between varying degrees of soft tissue and bone, the ease of use making the Norland XR-600 user friendly for the patient and the radiogrpaher, the ability of the scanner to accomodate more patient conditions (larger, slender etc) and ensuring a more accurate measure of the bone and body compostion, and most importantlly the ability to acquire accurate bone density measurements using extremely low radiation doses.


How It Works:

Modern Bone Mineral Densitometers use X-Ray beams of two different energies (dual X-Ray absorptiometry or DEXA). The energy of the X-Ray beams that pass through bones is absorbed, with the remainder of what is not absorbed travelling and exiting the other side of the body.  The transmitted X-Rays that are not absorbed are detected by the Bone Mineral Densitomer.  The transmitted X-Ray energy per pixel is detected and converted into a density which is measured in grams per centimeter. The number of pixels in the relevant area is added so that a bone density can be calculated for the specific bones in question.

The most commonly used areas to determine bone density are the lumbar spine and the proximal femur (hip).  The bone density measured for a patient is most usefull when compared to database's of other bone density measurements.  Two common measurements are used to compare bone density, the T score which are average female or male peak bone mass measurements, or the Z score which is a measurement of the bone mass related to the patient's age.


BMD Advantages over Other Types of Scans:

Bone Mineral Density scans are efficient, accurate and non ivasive, and provide the clinician with a means to accurately measure bone density.  Bone Mineral Density measurements are used to assess and follow up conditions which may impact the patients bone density.  The scans are reproducible, and allow for long term comparisons to be made, giving the doctor the ability to track the progress of osteoporis, or to track the progress of therapy which is designed to halt the progression of osteoporosis.


Body Composition

DEXA (dual X-Ray absorptiometry) is an accurate technology to perform a body composition scan.  It is used to assess total body bone mineral density and also to accurately measure the body's soft tissue composition.  Information such as regional muscle mass and fat mass can be assessed using the body composition scan.  Also a regional body fat percentage can be calculated, with an estimate of visceral adipose or fat tissue also measured.  This makes the body composition scan a useful tool for your personal trainer, dietitian or exercise physiologist, who can use your body composition results to customize your health assessment and provide individual advice.